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You are better off swapping the engine. Depending on year a 2.5l will slide in nicely. Do some bolt-ons to it plus cams and you are up to 200hp. It would take a fortune to get 200 hp out of a 2.2l while staying n/a.

Head work, stoking, cams and pistons would all have to be custom.

An intake, borla header, high flow cat, catback with torque chip would get you 20 extra hp or about up to a stock 2.5l. A lighter flywheel and that's about as good as it gets.

Nobody has really done a build up on a 2.2l to my knowledge. I would love to see someone do one though.

Originally posted by Blindeye_03 possibly the heads... there is nothing good about single exhaust ports .

-justin

They have 4-valve heads... its not an 8 valve motor.

I would contact Cobb and see what parts from the EJ25 match up. Im guessing the intake would at least, the exhaust system possibly, and the headers are a tossup but im guessing no.

If you wanted some serious flow you could always get some EJ25 Phase II heads and put some cams in them. I hear the worst problem with the EJ22 is the intake manifold which is more choked up than the EJ25 even.

The engine swap idea is always tempting but expensive.

If it was me I would figure out an intake, free up the exhaust system and look for an equal length header system (Borla= ). Then I would figure out a way to get the shortest gearing possibly through wheels/tires. Then I would get some underdrive pullies or a lighter crank pulley. Drop the air conditioning, strip the car of excess weight.

Basically your starting with a hampered powertrain, so you have to figure out a way to increase your power/weight ratio but cant really concentrate on the "power" section as much.

The Impreza L models with the 2.2 had longer gearing which hurt their performance also, you should really look to remedying this by staying away from 19" chrome wheels.

Originally posted by Snagtastic They have 4-valve heads... its not an 8 valve motor.

How many valves per cylinder has nothing to do with how many exhaust ports come off the head...The EJ22's found in the Imprezas have only 2 ports for all four cylinders. That's why you need these headers:

But since we still don't know which car he has, we can't be sure. I just learned the other day that older Legacies with a 2.2l engine have four ports...